A decision of the board of trustees denying or limiting membership, service credit, eligibility for or the amount of benefits payable by the retirement system, or regarding to whom benefits should be paid is a decision in a contested case as defined by the administrative procedure law, Chapter 2001, and is subject to judicial review under the substantial evidence rule in accordance with Sections 2001.174-2001.177.
Tex. Gov't. Code § 855.606